Think given how Siddle has been bowling in this series, swinging it a lot more than usual, he would have been excellent with the new ball. Starc has been decidedly average with it, so he has often been brought on fairly early anyway, but I think they missed a trick by not picking up on that earlier.

He's not been swinging it massive, which has actually made him quite dangerous. Tends to get it to go far too early with the new ball, doesn't draw the batsman into the stroke.